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Linux 4.2.1
[linux/fpc-iii.git] / drivers / usb / host / ohci-dbg.c
blobc3eded317495252ccc731ec9f96096da4ab59a88
1 /*
2 * OHCI HCD (Host Controller Driver) for USB.
3 *
4 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
5 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
6 *
7 * This file is licenced under the GPL.
8 */
9
10 /*-------------------------------------------------------------------------*/
11
12 #define edstring(ed_type) ({ char *temp; \
13 switch (ed_type) { \
14 case PIPE_CONTROL: temp = "ctrl"; break; \
15 case PIPE_BULK: temp = "bulk"; break; \
16 case PIPE_INTERRUPT: temp = "intr"; break; \
17 default: temp = "isoc"; break; \
18 } temp;})
19 #define pipestring(pipe) edstring(usb_pipetype(pipe))
20
21
22 #define ohci_dbg_sw(ohci, next, size, format, arg...) \
23 do { \
24 if (next != NULL) { \
25 unsigned s_len; \
26 s_len = scnprintf (*next, *size, format, ## arg ); \
27 *size -= s_len; *next += s_len; \
28 } else \
29 ohci_dbg(ohci,format, ## arg ); \
30 } while (0);
31
32 /* Version for use where "next" is the address of a local variable */
33 #define ohci_dbg_nosw(ohci, next, size, format, arg...) \
34 do { \
35 unsigned s_len; \
36 s_len = scnprintf(*next, *size, format, ## arg); \
37 *size -= s_len; *next += s_len; \
38 } while (0);
39
40
41 static void ohci_dump_intr_mask (
42 struct ohci_hcd *ohci,
43 char *label,
44 u32 mask,
45 char **next,
46 unsigned *size)
47 {
48 ohci_dbg_sw (ohci, next, size, "%s 0x%08x%s%s%s%s%s%s%s%s%s\n",
49 label,
50 mask,
51 (mask & OHCI_INTR_MIE) ? " MIE" : "",
52 (mask & OHCI_INTR_OC) ? " OC" : "",
53 (mask & OHCI_INTR_RHSC) ? " RHSC" : "",
54 (mask & OHCI_INTR_FNO) ? " FNO" : "",
55 (mask & OHCI_INTR_UE) ? " UE" : "",
56 (mask & OHCI_INTR_RD) ? " RD" : "",
57 (mask & OHCI_INTR_SF) ? " SF" : "",
58 (mask & OHCI_INTR_WDH) ? " WDH" : "",
59 (mask & OHCI_INTR_SO) ? " SO" : ""
60 );
61 }
62
63 static void maybe_print_eds (
64 struct ohci_hcd *ohci,
65 char *label,
66 u32 value,
67 char **next,
68 unsigned *size)
69 {
70 if (value)
71 ohci_dbg_sw (ohci, next, size, "%s %08x\n", label, value);
72 }
73
74 static char *hcfs2string (int state)
75 {
76 switch (state) {
77 case OHCI_USB_RESET: return "reset";
78 case OHCI_USB_RESUME: return "resume";
79 case OHCI_USB_OPER: return "operational";
80 case OHCI_USB_SUSPEND: return "suspend";
81 }
82 return "?";
83 }
84
85 static const char *rh_state_string(struct ohci_hcd *ohci)
86 {
87 switch (ohci->rh_state) {
88 case OHCI_RH_HALTED:
89 return "halted";
90 case OHCI_RH_SUSPENDED:
91 return "suspended";
92 case OHCI_RH_RUNNING:
93 return "running";
94 }
95 return "?";
96 }
97
98 // dump control and status registers
99 static void
100 ohci_dump_status (struct ohci_hcd *controller, char **next, unsigned *size)
101 {
102 struct ohci_regs __iomem *regs = controller->regs;
103 u32 temp;
104
105 temp = ohci_readl (controller, &regs->revision) & 0xff;
106 ohci_dbg_sw (controller, next, size,
107 "OHCI %d.%d, %s legacy support registers, rh state %s\n",
108 0x03 & (temp >> 4), (temp & 0x0f),
109 (temp & 0x0100) ? "with" : "NO",
110 rh_state_string(controller));
111
112 temp = ohci_readl (controller, &regs->control);
113 ohci_dbg_sw (controller, next, size,
114 "control 0x%03x%s%s%s HCFS=%s%s%s%s%s CBSR=%d\n",
115 temp,
116 (temp & OHCI_CTRL_RWE) ? " RWE" : "",
117 (temp & OHCI_CTRL_RWC) ? " RWC" : "",
118 (temp & OHCI_CTRL_IR) ? " IR" : "",
119 hcfs2string (temp & OHCI_CTRL_HCFS),
120 (temp & OHCI_CTRL_BLE) ? " BLE" : "",
121 (temp & OHCI_CTRL_CLE) ? " CLE" : "",
122 (temp & OHCI_CTRL_IE) ? " IE" : "",
123 (temp & OHCI_CTRL_PLE) ? " PLE" : "",
124 temp & OHCI_CTRL_CBSR
125 );
126
127 temp = ohci_readl (controller, &regs->cmdstatus);
128 ohci_dbg_sw (controller, next, size,
129 "cmdstatus 0x%05x SOC=%d%s%s%s%s\n", temp,
130 (temp & OHCI_SOC) >> 16,
131 (temp & OHCI_OCR) ? " OCR" : "",
132 (temp & OHCI_BLF) ? " BLF" : "",
133 (temp & OHCI_CLF) ? " CLF" : "",
134 (temp & OHCI_HCR) ? " HCR" : ""
135 );
136
137 ohci_dump_intr_mask (controller, "intrstatus",
138 ohci_readl (controller, &regs->intrstatus),
139 next, size);
140 ohci_dump_intr_mask (controller, "intrenable",
141 ohci_readl (controller, &regs->intrenable),
142 next, size);
143 // intrdisable always same as intrenable
144
145 maybe_print_eds (controller, "ed_periodcurrent",
146 ohci_readl (controller, &regs->ed_periodcurrent),
147 next, size);
148
149 maybe_print_eds (controller, "ed_controlhead",
150 ohci_readl (controller, &regs->ed_controlhead),
151 next, size);
152 maybe_print_eds (controller, "ed_controlcurrent",
153 ohci_readl (controller, &regs->ed_controlcurrent),
154 next, size);
155
156 maybe_print_eds (controller, "ed_bulkhead",
157 ohci_readl (controller, &regs->ed_bulkhead),
158 next, size);
159 maybe_print_eds (controller, "ed_bulkcurrent",
160 ohci_readl (controller, &regs->ed_bulkcurrent),
161 next, size);
162
163 maybe_print_eds (controller, "donehead",
164 ohci_readl (controller, &regs->donehead), next, size);
165 }
166
167 #define dbg_port_sw(hc,num,value,next,size) \
168 ohci_dbg_sw (hc, next, size, \
169 "roothub.portstatus [%d] " \
170 "0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
171 num, temp, \
172 (temp & RH_PS_PRSC) ? " PRSC" : "", \
173 (temp & RH_PS_OCIC) ? " OCIC" : "", \
174 (temp & RH_PS_PSSC) ? " PSSC" : "", \
175 (temp & RH_PS_PESC) ? " PESC" : "", \
176 (temp & RH_PS_CSC) ? " CSC" : "", \
177 \
178 (temp & RH_PS_LSDA) ? " LSDA" : "", \
179 (temp & RH_PS_PPS) ? " PPS" : "", \
180 (temp & RH_PS_PRS) ? " PRS" : "", \
181 (temp & RH_PS_POCI) ? " POCI" : "", \
182 (temp & RH_PS_PSS) ? " PSS" : "", \
183 \
184 (temp & RH_PS_PES) ? " PES" : "", \
185 (temp & RH_PS_CCS) ? " CCS" : "" \
186 );
187
188
189 static void
190 ohci_dump_roothub (
191 struct ohci_hcd *controller,
192 int verbose,
193 char **next,
194 unsigned *size)
195 {
196 u32 temp, i;
197
198 temp = roothub_a (controller);
199 if (temp == ~(u32)0)
200 return;
201
202 if (verbose) {
203 ohci_dbg_sw (controller, next, size,
204 "roothub.a %08x POTPGT=%d%s%s%s%s%s NDP=%d(%d)\n", temp,
205 ((temp & RH_A_POTPGT) >> 24) & 0xff,
206 (temp & RH_A_NOCP) ? " NOCP" : "",
207 (temp & RH_A_OCPM) ? " OCPM" : "",
208 (temp & RH_A_DT) ? " DT" : "",
209 (temp & RH_A_NPS) ? " NPS" : "",
210 (temp & RH_A_PSM) ? " PSM" : "",
211 (temp & RH_A_NDP), controller->num_ports
212 );
213 temp = roothub_b (controller);
214 ohci_dbg_sw (controller, next, size,
215 "roothub.b %08x PPCM=%04x DR=%04x\n",
216 temp,
217 (temp & RH_B_PPCM) >> 16,
218 (temp & RH_B_DR)
219 );
220 temp = roothub_status (controller);
221 ohci_dbg_sw (controller, next, size,
222 "roothub.status %08x%s%s%s%s%s%s\n",
223 temp,
224 (temp & RH_HS_CRWE) ? " CRWE" : "",
225 (temp & RH_HS_OCIC) ? " OCIC" : "",
226 (temp & RH_HS_LPSC) ? " LPSC" : "",
227 (temp & RH_HS_DRWE) ? " DRWE" : "",
228 (temp & RH_HS_OCI) ? " OCI" : "",
229 (temp & RH_HS_LPS) ? " LPS" : ""
230 );
231 }
232
233 for (i = 0; i < controller->num_ports; i++) {
234 temp = roothub_portstatus (controller, i);
235 dbg_port_sw (controller, i, temp, next, size);
236 }
237 }
238
239 static void ohci_dump(struct ohci_hcd *controller)
240 {
241 ohci_dbg (controller, "OHCI controller state\n");
242
243 // dumps some of the state we know about
244 ohci_dump_status (controller, NULL, NULL);
245 if (controller->hcca)
246 ohci_dbg (controller,
247 "hcca frame #%04x\n", ohci_frame_no(controller));
248 ohci_dump_roothub (controller, 1, NULL, NULL);
249 }
250
251 static const char data0 [] = "DATA0";
252 static const char data1 [] = "DATA1";
253
254 static void ohci_dump_td (const struct ohci_hcd *ohci, const char *label,
255 const struct td *td)
256 {
257 u32 tmp = hc32_to_cpup (ohci, &td->hwINFO);
258
259 ohci_dbg (ohci, "%s td %p%s; urb %p index %d; hw next td %08x\n",
260 label, td,
261 (tmp & TD_DONE) ? " (DONE)" : "",
262 td->urb, td->index,
263 hc32_to_cpup (ohci, &td->hwNextTD));
264 if ((tmp & TD_ISO) == 0) {
265 const char *toggle, *pid;
266 u32 cbp, be;
267
268 switch (tmp & TD_T) {
269 case TD_T_DATA0: toggle = data0; break;
270 case TD_T_DATA1: toggle = data1; break;
271 case TD_T_TOGGLE: toggle = "(CARRY)"; break;
272 default: toggle = "(?)"; break;
273 }
274 switch (tmp & TD_DP) {
275 case TD_DP_SETUP: pid = "SETUP"; break;
276 case TD_DP_IN: pid = "IN"; break;
277 case TD_DP_OUT: pid = "OUT"; break;
278 default: pid = "(bad pid)"; break;
279 }
280 ohci_dbg (ohci, " info %08x CC=%x %s DI=%d %s %s\n", tmp,
281 TD_CC_GET(tmp), /* EC, */ toggle,
282 (tmp & TD_DI) >> 21, pid,
283 (tmp & TD_R) ? "R" : "");
284 cbp = hc32_to_cpup (ohci, &td->hwCBP);
285 be = hc32_to_cpup (ohci, &td->hwBE);
286 ohci_dbg (ohci, " cbp %08x be %08x (len %d)\n", cbp, be,
287 cbp ? (be + 1 - cbp) : 0);
288 } else {
289 unsigned i;
290 ohci_dbg (ohci, " info %08x CC=%x FC=%d DI=%d SF=%04x\n", tmp,
291 TD_CC_GET(tmp),
292 (tmp >> 24) & 0x07,
293 (tmp & TD_DI) >> 21,
294 tmp & 0x0000ffff);
295 ohci_dbg (ohci, " bp0 %08x be %08x\n",
296 hc32_to_cpup (ohci, &td->hwCBP) & ~0x0fff,
297 hc32_to_cpup (ohci, &td->hwBE));
298 for (i = 0; i < MAXPSW; i++) {
299 u16 psw = ohci_hwPSW (ohci, td, i);
300 int cc = (psw >> 12) & 0x0f;
301 ohci_dbg (ohci, " psw [%d] = %2x, CC=%x %s=%d\n", i,
302 psw, cc,
303 (cc >= 0x0e) ? "OFFSET" : "SIZE",
304 psw & 0x0fff);
305 }
306 }
307 }
308
309 /* caller MUST own hcd spinlock if verbose is set! */
310 static void __maybe_unused
311 ohci_dump_ed (const struct ohci_hcd *ohci, const char *label,
312 const struct ed *ed, int verbose)
313 {
314 u32 tmp = hc32_to_cpu (ohci, ed->hwINFO);
315 char *type = "";
316
317 ohci_dbg (ohci, "%s, ed %p state 0x%x type %s; next ed %08x\n",
318 label,
319 ed, ed->state, edstring (ed->type),
320 hc32_to_cpup (ohci, &ed->hwNextED));
321 switch (tmp & (ED_IN|ED_OUT)) {
322 case ED_OUT: type = "-OUT"; break;
323 case ED_IN: type = "-IN"; break;
324 /* else from TDs ... control */
325 }
326 ohci_dbg (ohci,
327 " info %08x MAX=%d%s%s%s%s EP=%d%s DEV=%d\n", tmp,
328 0x03ff & (tmp >> 16),
329 (tmp & ED_DEQUEUE) ? " DQ" : "",
330 (tmp & ED_ISO) ? " ISO" : "",
331 (tmp & ED_SKIP) ? " SKIP" : "",
332 (tmp & ED_LOWSPEED) ? " LOW" : "",
333 0x000f & (tmp >> 7),
334 type,
335 0x007f & tmp);
336 tmp = hc32_to_cpup (ohci, &ed->hwHeadP);
337 ohci_dbg (ohci, " tds: head %08x %s%s tail %08x%s\n",
338 tmp,
339 (tmp & ED_C) ? data1 : data0,
340 (tmp & ED_H) ? " HALT" : "",
341 hc32_to_cpup (ohci, &ed->hwTailP),
342 verbose ? "" : " (not listing)");
343 if (verbose) {
344 struct list_head *tmp;
345
346 /* use ed->td_list because HC concurrently modifies
347 * hwNextTD as it accumulates ed_donelist.
348 */
349 list_for_each (tmp, &ed->td_list) {
350 struct td *td;
351 td = list_entry (tmp, struct td, td_list);
352 ohci_dump_td (ohci, " ->", td);
353 }
354 }
355 }
356
357 /*-------------------------------------------------------------------------*/
358
359 static int debug_async_open(struct inode *, struct file *);
360 static int debug_periodic_open(struct inode *, struct file *);
361 static int debug_registers_open(struct inode *, struct file *);
362 static int debug_async_open(struct inode *, struct file *);
363 static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
364 static int debug_close(struct inode *, struct file *);
365
366 static const struct file_operations debug_async_fops = {
367 .owner = THIS_MODULE,
368 .open = debug_async_open,
369 .read = debug_output,
370 .release = debug_close,
371 .llseek = default_llseek,
372 };
373 static const struct file_operations debug_periodic_fops = {
374 .owner = THIS_MODULE,
375 .open = debug_periodic_open,
376 .read = debug_output,
377 .release = debug_close,
378 .llseek = default_llseek,
379 };
380 static const struct file_operations debug_registers_fops = {
381 .owner = THIS_MODULE,
382 .open = debug_registers_open,
383 .read = debug_output,
384 .release = debug_close,
385 .llseek = default_llseek,
386 };
387
388 static struct dentry *ohci_debug_root;
389
390 struct debug_buffer {
391 ssize_t (*fill_func)(struct debug_buffer *); /* fill method */
392 struct ohci_hcd *ohci;
393 struct mutex mutex; /* protect filling of buffer */
394 size_t count; /* number of characters filled into buffer */
395 char *page;
396 };
397
398 static ssize_t
399 show_list (struct ohci_hcd *ohci, char *buf, size_t count, struct ed *ed)
400 {
401 unsigned temp, size = count;
402
403 if (!ed)
404 return 0;
405
406 /* print first --> last */
407 while (ed->ed_prev)
408 ed = ed->ed_prev;
409
410 /* dump a snapshot of the bulk or control schedule */
411 while (ed) {
412 u32 info = hc32_to_cpu (ohci, ed->hwINFO);
413 u32 headp = hc32_to_cpu (ohci, ed->hwHeadP);
414 struct list_head *entry;
415 struct td *td;
416
417 temp = scnprintf (buf, size,
418 "ed/%p %cs dev%d ep%d%s max %d %08x%s%s %s",
419 ed,
420 (info & ED_LOWSPEED) ? 'l' : 'f',
421 info & 0x7f,
422 (info >> 7) & 0xf,
423 (info & ED_IN) ? "in" : "out",
424 0x03ff & (info >> 16),
425 info,
426 (info & ED_SKIP) ? " s" : "",
427 (headp & ED_H) ? " H" : "",
428 (headp & ED_C) ? data1 : data0);
429 size -= temp;
430 buf += temp;
431
432 list_for_each (entry, &ed->td_list) {
433 u32 cbp, be;
434
435 td = list_entry (entry, struct td, td_list);
436 info = hc32_to_cpup (ohci, &td->hwINFO);
437 cbp = hc32_to_cpup (ohci, &td->hwCBP);
438 be = hc32_to_cpup (ohci, &td->hwBE);
439 temp = scnprintf (buf, size,
440 "\n\ttd %p %s %d cc=%x urb %p (%08x)",
441 td,
442 ({ char *pid;
443 switch (info & TD_DP) {
444 case TD_DP_SETUP: pid = "setup"; break;
445 case TD_DP_IN: pid = "in"; break;
446 case TD_DP_OUT: pid = "out"; break;
447 default: pid = "(?)"; break;
448 } pid;}),
449 cbp ? (be + 1 - cbp) : 0,
450 TD_CC_GET (info), td->urb, info);
451 size -= temp;
452 buf += temp;
453 }
454
455 temp = scnprintf (buf, size, "\n");
456 size -= temp;
457 buf += temp;
458
459 ed = ed->ed_next;
460 }
461 return count - size;
462 }
463
464 static ssize_t fill_async_buffer(struct debug_buffer *buf)
465 {
466 struct ohci_hcd *ohci;
467 size_t temp, size;
468 unsigned long flags;
469
470 ohci = buf->ohci;
471 size = PAGE_SIZE;
472
473 /* display control and bulk lists together, for simplicity */
474 spin_lock_irqsave (&ohci->lock, flags);
475 temp = show_list(ohci, buf->page, size, ohci->ed_controltail);
476 temp += show_list(ohci, buf->page + temp, size - temp,
477 ohci->ed_bulktail);
478 spin_unlock_irqrestore (&ohci->lock, flags);
479
480 return temp;
481 }
482
483 #define DBG_SCHED_LIMIT 64
484
485 static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
486 {
487 struct ohci_hcd *ohci;
488 struct ed **seen, *ed;
489 unsigned long flags;
490 unsigned temp, size, seen_count;
491 char *next;
492 unsigned i;
493
494 seen = kmalloc(DBG_SCHED_LIMIT * sizeof *seen, GFP_ATOMIC);
495 if (!seen)
496 return 0;
497 seen_count = 0;
498
499 ohci = buf->ohci;
500 next = buf->page;
501 size = PAGE_SIZE;
502
503 temp = scnprintf (next, size, "size = %d\n", NUM_INTS);
504 size -= temp;
505 next += temp;
506
507 /* dump a snapshot of the periodic schedule (and load) */
508 spin_lock_irqsave (&ohci->lock, flags);
509 for (i = 0; i < NUM_INTS; i++) {
510 ed = ohci->periodic[i];
511 if (!ed)
512 continue;
513
514 temp = scnprintf (next, size, "%2d [%3d]:", i, ohci->load [i]);
515 size -= temp;
516 next += temp;
517
518 do {
519 temp = scnprintf (next, size, " ed%d/%p",
520 ed->interval, ed);
521 size -= temp;
522 next += temp;
523 for (temp = 0; temp < seen_count; temp++) {
524 if (seen [temp] == ed)
525 break;
526 }
527
528 /* show more info the first time around */
529 if (temp == seen_count) {
530 u32 info = hc32_to_cpu (ohci, ed->hwINFO);
531 struct list_head *entry;
532 unsigned qlen = 0;
533
534 /* qlen measured here in TDs, not urbs */
535 list_for_each (entry, &ed->td_list)
536 qlen++;
537
538 temp = scnprintf (next, size,
539 " (%cs dev%d ep%d%s-%s qlen %u"
540 " max %d %08x%s%s)",
541 (info & ED_LOWSPEED) ? 'l' : 'f',
542 info & 0x7f,
543 (info >> 7) & 0xf,
544 (info & ED_IN) ? "in" : "out",
545 (info & ED_ISO) ? "iso" : "int",
546 qlen,
547 0x03ff & (info >> 16),
548 info,
549 (info & ED_SKIP) ? " K" : "",
550 (ed->hwHeadP &
551 cpu_to_hc32(ohci, ED_H)) ?
552 " H" : "");
553 size -= temp;
554 next += temp;
555
556 if (seen_count < DBG_SCHED_LIMIT)
557 seen [seen_count++] = ed;
558
559 ed = ed->ed_next;
560
561 } else {
562 /* we've seen it and what's after */
563 temp = 0;
564 ed = NULL;
565 }
566
567 } while (ed);
568
569 temp = scnprintf (next, size, "\n");
570 size -= temp;
571 next += temp;
572 }
573 spin_unlock_irqrestore (&ohci->lock, flags);
574 kfree (seen);
575
576 return PAGE_SIZE - size;
577 }
578 #undef DBG_SCHED_LIMIT
579
580 static ssize_t fill_registers_buffer(struct debug_buffer *buf)
581 {
582 struct usb_hcd *hcd;
583 struct ohci_hcd *ohci;
584 struct ohci_regs __iomem *regs;
585 unsigned long flags;
586 unsigned temp, size;
587 char *next;
588 u32 rdata;
589
590 ohci = buf->ohci;
591 hcd = ohci_to_hcd(ohci);
592 regs = ohci->regs;
593 next = buf->page;
594 size = PAGE_SIZE;
595
596 spin_lock_irqsave (&ohci->lock, flags);
597
598 /* dump driver info, then registers in spec order */
599
600 ohci_dbg_nosw(ohci, &next, &size,
601 "bus %s, device %s\n"
602 "%s\n"
603 "%s\n",
604 hcd->self.controller->bus->name,
605 dev_name(hcd->self.controller),
606 hcd->product_desc,
607 hcd_name);
608
609 if (!HCD_HW_ACCESSIBLE(hcd)) {
610 size -= scnprintf (next, size,
611 "SUSPENDED (no register access)\n");
612 goto done;
613 }
614
615 ohci_dump_status(ohci, &next, &size);
616
617 /* hcca */
618 if (ohci->hcca)
619 ohci_dbg_nosw(ohci, &next, &size,
620 "hcca frame 0x%04x\n", ohci_frame_no(ohci));
621
622 /* other registers mostly affect frame timings */
623 rdata = ohci_readl (ohci, &regs->fminterval);
624 temp = scnprintf (next, size,
625 "fmintvl 0x%08x %sFSMPS=0x%04x FI=0x%04x\n",
626 rdata, (rdata >> 31) ? "FIT " : "",
627 (rdata >> 16) & 0xefff, rdata & 0xffff);
628 size -= temp;
629 next += temp;
630
631 rdata = ohci_readl (ohci, &regs->fmremaining);
632 temp = scnprintf (next, size, "fmremaining 0x%08x %sFR=0x%04x\n",
633 rdata, (rdata >> 31) ? "FRT " : "",
634 rdata & 0x3fff);
635 size -= temp;
636 next += temp;
637
638 rdata = ohci_readl (ohci, &regs->periodicstart);
639 temp = scnprintf (next, size, "periodicstart 0x%04x\n",
640 rdata & 0x3fff);
641 size -= temp;
642 next += temp;
643
644 rdata = ohci_readl (ohci, &regs->lsthresh);
645 temp = scnprintf (next, size, "lsthresh 0x%04x\n",
646 rdata & 0x3fff);
647 size -= temp;
648 next += temp;
649
650 temp = scnprintf (next, size, "hub poll timer %s\n",
651 HCD_POLL_RH(ohci_to_hcd(ohci)) ? "ON" : "off");
652 size -= temp;
653 next += temp;
654
655 /* roothub */
656 ohci_dump_roothub (ohci, 1, &next, &size);
657
658 done:
659 spin_unlock_irqrestore (&ohci->lock, flags);
660
661 return PAGE_SIZE - size;
662 }
663
664 static struct debug_buffer *alloc_buffer(struct ohci_hcd *ohci,
665 ssize_t (*fill_func)(struct debug_buffer *))
666 {
667 struct debug_buffer *buf;
668
669 buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
670
671 if (buf) {
672 buf->ohci = ohci;
673 buf->fill_func = fill_func;
674 mutex_init(&buf->mutex);
675 }
676
677 return buf;
678 }
679
680 static int fill_buffer(struct debug_buffer *buf)
681 {
682 int ret = 0;
683
684 if (!buf->page)
685 buf->page = (char *)get_zeroed_page(GFP_KERNEL);
686
687 if (!buf->page) {
688 ret = -ENOMEM;
689 goto out;
690 }
691
692 ret = buf->fill_func(buf);
693
694 if (ret >= 0) {
695 buf->count = ret;
696 ret = 0;
697 }
698
699 out:
700 return ret;
701 }
702
703 static ssize_t debug_output(struct file *file, char __user *user_buf,
704 size_t len, loff_t *offset)
705 {
706 struct debug_buffer *buf = file->private_data;
707 int ret = 0;
708
709 mutex_lock(&buf->mutex);
710 if (buf->count == 0) {
711 ret = fill_buffer(buf);
712 if (ret != 0) {
713 mutex_unlock(&buf->mutex);
714 goto out;
715 }
716 }
717 mutex_unlock(&buf->mutex);
718
719 ret = simple_read_from_buffer(user_buf, len, offset,
720 buf->page, buf->count);
721
722 out:
723 return ret;
724
725 }
726
727 static int debug_close(struct inode *inode, struct file *file)
728 {
729 struct debug_buffer *buf = file->private_data;
730
731 if (buf) {
732 if (buf->page)
733 free_page((unsigned long)buf->page);
734 kfree(buf);
735 }
736
737 return 0;
738 }
739 static int debug_async_open(struct inode *inode, struct file *file)
740 {
741 file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
742
743 return file->private_data ? 0 : -ENOMEM;
744 }
745
746 static int debug_periodic_open(struct inode *inode, struct file *file)
747 {
748 file->private_data = alloc_buffer(inode->i_private,
749 fill_periodic_buffer);
750
751 return file->private_data ? 0 : -ENOMEM;
752 }
753
754 static int debug_registers_open(struct inode *inode, struct file *file)
755 {
756 file->private_data = alloc_buffer(inode->i_private,
757 fill_registers_buffer);
758
759 return file->private_data ? 0 : -ENOMEM;
760 }
761 static inline void create_debug_files (struct ohci_hcd *ohci)
762 {
763 struct usb_bus *bus = &ohci_to_hcd(ohci)->self;
764
765 ohci->debug_dir = debugfs_create_dir(bus->bus_name, ohci_debug_root);
766 if (!ohci->debug_dir)
767 goto dir_error;
768
769 ohci->debug_async = debugfs_create_file("async", S_IRUGO,
770 ohci->debug_dir, ohci,
771 &debug_async_fops);
772 if (!ohci->debug_async)
773 goto async_error;
774
775 ohci->debug_periodic = debugfs_create_file("periodic", S_IRUGO,
776 ohci->debug_dir, ohci,
777 &debug_periodic_fops);
778 if (!ohci->debug_periodic)
779 goto periodic_error;
780
781 ohci->debug_registers = debugfs_create_file("registers", S_IRUGO,
782 ohci->debug_dir, ohci,
783 &debug_registers_fops);
784 if (!ohci->debug_registers)
785 goto registers_error;
786
787 ohci_dbg (ohci, "created debug files\n");
788 return;
789
790 registers_error:
791 debugfs_remove(ohci->debug_periodic);
792 periodic_error:
793 debugfs_remove(ohci->debug_async);
794 async_error:
795 debugfs_remove(ohci->debug_dir);
796 dir_error:
797 ohci->debug_periodic = NULL;
798 ohci->debug_async = NULL;
799 ohci->debug_dir = NULL;
800 }
801
802 static inline void remove_debug_files (struct ohci_hcd *ohci)
803 {
804 debugfs_remove(ohci->debug_registers);
805 debugfs_remove(ohci->debug_periodic);
806 debugfs_remove(ohci->debug_async);
807 debugfs_remove(ohci->debug_dir);
808 }
809
810 /*-------------------------------------------------------------------------*/
811
Linux with added FPC-III support